IR System

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IR System

What is an Infrared (IR) System?

An IR System, an assistive listening device, is a wireless system that uses infrared light to transmit sound. A transmitter converts sound into a light signal and beams it to a receiver that is worn by the listener. The receiver decodes the infrared signal back to sound. These systems can only be used indoors and the receiver must be in the direct line of sight of the light bean from the transmitter. People whose hearing aids or cochlear implants have a telecoil may also wear a neckloop or silhouette inductor to convert the infrared signal into a magnetic signal, which can be picked up through their telecoil.

How do infrared hearing systems work?

1 The input to an infrared system can be from a microphone, a sound system or any other audio source. They each produce an electrical signal which contains the audio information.

2 This signal is fed to the modulator which prepares the audio signal for the subsequent infrared (IR) transmission.

3 This processed electrical signal is then fed to the radiator. The radiator diodes produce the (invisible) infrared light and radiate it into the room.

4 Wireless receivers are used to convert the infrared light signal back into an electrical signal and then into an audio signal again (or a personal induction loop if used by a hearing aid wearer). There is no limit to the number of receivers that can be used on a system.

Why use an infrared hearing system?

Infrared hearing system have many advantages over induction loop systems-

-Infrared light cannot penetrate walls or ceilings so overspill does not occur, unlike perimeter induction loop systems. This allows systems to be used in adjacent rooms and in rooms where confidential meeting take place e.g. Court rooms, boardrooms, interview rooms, etc

-There is no loop wire to run around the perimeter so it is easier to install in rooms with multi-levels e.g. Theatres, or wide areas e.g. Exhibition halls.

-As infrared light carries the signal there are no losses due to the amount of steel in the construction of the room which can affect the signal and frequency response of induction loop systems. Systems can also be used (with stethoset receivers) in environments with high background magnetic interference.

-Portable infrared hearing systems (like the SENNSIS systems) are quicker to set up than portable induction loop systems as there is no wire antenna to install around the perimeter of the room. There are also reduced Health and Safety issues associated with trailing wires.

-Multichannel systems are available.

For multichannel infrared systems an external modulator is installed which feeds the radiators. Typical examples where twin channel infrared systems are used are-

-In a cinema, a twin channel infrared system would be used to feed the film soundtrack for hearing impaired people on one channel, and an audio description to assist visually impaired people on the other channel. Signs and an announcement before each film inform customers that the system is available. Receivers are then issued to the customers who request to use the system.

-In a council chamber or conference room where bilingual meetings take place and a hearing support system is required (to comply with the Disability Discrimination Act). In this case one channel of the system would be fed by an interpreter’s microphone, and the another channel fed from the floor language via microphones (or a sound system).

-Twin channel receivers are used by the delegates to listen to either the translated or the floor language. These systems are commonly used throughout countries such as Wales.

-Twin channel systems can also be used for stereo sound applications.

If more than 2 channels are needed then a narrow band infrared system can be installed allowing up to 32 channels. These are used for simultaneous interpretation at international meetings.

IR 1411 Transmitter

Item no.: 650300

Infrared Transmitter for small to medium size area

High Performing Assistive Listening

Univox® IR1411 is a compact yet powerful IR transmitter for small to medium size venues. The sleek low-profile design allows for quick and easy installation in boardrooms, houses of worship, cinemas/theatres, court rooms, nursing homes, auditoriums and class rooms etc.
The powerful infrared transmitter features an all-in-one modulator and 72-diodes emitter for high performance and large coverage – up to 600 m2 with a single unit.
Univox® IR1411 provides wireless assistive listening with high audio quality. With two mono channels or single channel stereo operation on 2.3 and 2.8 MHz carrier frequencies, the unit is ideal for applications where information security and overspill control is of importance.


Features :

  • Secure wireless communication
  • Compact design
  • 2 Watt infrared emitter with integrated modulator
  • Selectable 2.3 and 2.8MHz carrier frequencies
  • 600m(6458ft2) coverage range
  • 2 mono channels or 1 stereo
  • 72 high efficiency diodes for maximum coverage
  • Convection cooled
  • Automatic gain control
  • Power-save mode with Auto On/Off function
  • Audio level indicators
  • Volume control
  • Wall/ceiling mount included

IRR-1 Receiver

Item no.: 650301

Pendant Infrared Receiver

High Performing Assistive Listening

Univox® IRR-1 receiver is a wireless 2-channel, stereo infrared pendant receiver designed for professional applications. Equipped with multiple receiving diodes for increased sensitivity, the receiver works with transmitters operating on 2.3/2.8 MHz bandwidth.
Powered by a rechargeable Lithium Polymer battery, this lightweight receiver is to be worn around the neck, pendant-style (with supplied lanyard) or clipped on a pocket. The unit is easy to operate – select the channel frequency and adjust the volume with the intuitive slide volume control.
Univox® IRR-1 receiver can be used with Univox NL-90 neck induction loop to supplement personal hearing aids with a telecoil /T-switch setting, as well as with EM-101 single-sided earphone and EM-201 headphones for users with no or little hearing loss.


  • IR transparent case for wider scope of coverage and greater sensitivity
  • Li-Polymer battery for quick charging and light weight
  • Selectable 2.3 and 2.8 MHz carrier frequencies
  • 2 mono channels or 1 stereo
  • Unit automatically turns on when 3.5 mm jack is inserted
  • USB charging port (cable included)
  • Lanyard (included) and pocket spring clip on back to wear in a variety of ways
  • Slide volume and channel selection for simple operation
  • Designed to be used with either Univox neck loop or head-/earphones (accessories)

USB 5 port charging station

Item no.:682002

for 5 devices

Multiple USB-port charging station

USB charging station can charge up to 5 devices simultaneously. Equipped with smart IC chipset, fast charging ports, over-charge and over-heat protection, the unit allows for easy and efficient charging.
Connect the rechargeable units to the charger station by using a micro-USB cable. Just plug the USB end of the cords into the side of the charging station, set the unit on its side with the charging port facing the cable, and plug it in to charger. The charging station plugs directly into the wall, taking up only one outlet to charge up to five devices at a time.
1.5m (2-pin) connect cable is included.


  • 5 USB charging ports;
    – 2 fast charging ports (2,4A)
    – 3 standard ports (1A)
  • Input 100-240VAC
  • Output 30W 5V 6A max
  • Size 155 x 125 x 65mm
  • Weight 400g

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